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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | 9. Property, Plant and Equipment, Net The components of net property, plant and equipment were as follows:
| December 31,
(in millions) | 2020 |  | 2019
Land and improvements | $ | 23.2 |  |  | $ | 24.0 |
Buildings and improvements to leaseholds | 145.9 |  |  | 145.0 |
Machinery and equipment | 480.4 |  |  | 475.1 |
Construction in progress | 8.3 |  |  | 7.6 |
| 657.8 |  |  | 651.7 |
Less: accumulated depreciation | (416.4) |  |  | (384.6) |
Property, plant and equipment, net(1) | $ | 241.4 |  |  | $ | 267.1 |
(1)Net property, plant and equipment as of December 31, 2020 and 2019 contained $65.8 million and $68.5 million of computer software assets, respectively, which are classified within machinery and equipment and construction in progress. Depreciation expense for software was $11.4 million, $8.9 million and $8.2 million for the years ended December 31, 2020, 2019 and 2018, respectively.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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